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Hi,
Last year I was on a boat with a small Yanmar engine. Hand cranking was the only engine starting option, it was not fitted with a starter motor from new as far as I know.
I can't remember the all the details but it had some kind of mechanism which held the decompression levers open. On about the 4th or 5th turn of the hand crank the compression dropped in automatically whilst you were cranking away. Had no problems getting it started. I didn't pay to much attention but it all looked like a genuine part of the engine. So may be it is available from Yanmar if you know the right question to ask.
Cheers
Ian
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